Is Dimir House Guard legal in Standard, Modern, and Commander?

Dimir House Guard is legal in: Modern, Legacy, Vintage, Commander, Pauper.

What type of card is Dimir House Guard?

Dimir House Guard is a Creature — Skeleton. Its oracle text reads: "Fear (This creature can't be blocked except by artifact creatures and/or black creatures.) Sacrifice a creature: Regenerate this creature. Transmute {1}{B}{B} ({1}{B}{B}, Discard this card: Search your library for a card with the same mana value as this card, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.) Power/Toughness: 2/3"

Dimir House Guard

Creature — Skeleton

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

Sacrifice a creature: Regenerate this creature.

Transmute (, Discard this card: Search your library for a card with the same mana value as this card, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)